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//------------------------------------------------------------------------------
// <copyright file="ServerConfig.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Web.Configuration {
using System.Configuration;
using System.Collections;
using System.Collections.Generic;
using System.Globalization;
using System.Security;
using System.Security.Permissions;
using System.Text;
using System.Threading;
using System.Web.Util;
using System.Web.Hosting;
using System.Web.Caching;
using System.Web.Compilation;
using Microsoft.Win32;
//
// Abstracts differences between config retreived from IIS 6 metabase
// and config retreived from new IIS7 configuration system.
//
static internal class ServerConfig {
static int s_iisMajorVersion = 0;
static object s_expressConfigsLock = new object();
// used in the default domain only, by the ClientBuildManager
static Dictionary<string, ExpressServerConfig> s_expressConfigs;
static string s_iisExpressVersion;
// used in non-default domains only, by the ClientBuildManager
internal static string IISExpressVersion {
get {
return s_iisExpressVersion;
}
set {
if (Thread.GetDomain().IsDefaultAppDomain() || (s_iisExpressVersion != null && s_iisExpressVersion != value ))
throw new InvalidOperationException();
s_iisExpressVersion = value;
}
}
internal static bool UseMetabase {
[RegistryPermissionAttribute(SecurityAction.Assert, Read = "HKEY_LOCAL_MACHINE\\Software\\Microsoft\\InetStp")]
get {
if (IISExpressVersion != null) {
return false;
}
if (s_iisMajorVersion == 0) {
int version;
try {
object ver = Registry.GetValue("HKEY_LOCAL_MACHINE\\Software\\Microsoft\\InetStp", "MajorVersion", 0);
version = (ver != null) ? (int)ver : -1;
}
catch (ArgumentException) {
// Ignore ArgumentException from Registry.GetValue. This may indicate that the key does not exist, i.e. IIS not installed
version = -1; // Key not found
}
Interlocked.CompareExchange(ref s_iisMajorVersion, version, 0);
}
return s_iisMajorVersion <= 6;
}
}
static internal IServerConfig GetInstance() {
// IIS 7 bits on <= IIS 6: use the metabase
if (UseMetabase) {
return MetabaseServerConfig.GetInstance();
}
if (IISExpressVersion == null) {
return ProcessHostServerConfig.GetInstance();
}
return ExpressServerConfig.GetInstance(IISExpressVersion);
}
static internal IServerConfig GetDefaultDomainInstance(string version) {
if (version == null) {
return GetInstance();
}
ExpressServerConfig expressConfig = null;
lock (s_expressConfigsLock) {
if (s_expressConfigs == null) {
if (!Thread.GetDomain().IsDefaultAppDomain()) {
throw new InvalidOperationException();
}
s_expressConfigs = new Dictionary<string, ExpressServerConfig>(3);
}
if (!s_expressConfigs.TryGetValue(version, out expressConfig)) {
expressConfig = new ExpressServerConfig(version);
s_expressConfigs[version] = expressConfig;
}
}
return expressConfig;
}
//
// Return true in cases where web server configuration should be used
// to resolve paths.
//
static int s_useServerConfig = -1;
static internal bool UseServerConfig {
get {
if (s_useServerConfig == -1) {
int useServerConfig = 0;
// Must use web server config if there is no hosting environment
if (!HostingEnvironment.IsHosted) {
useServerConfig = 1;
}
// Hosting environment is the web server
else if (HostingEnvironment.ApplicationHostInternal is ISAPIApplicationHost) {
useServerConfig = 1;
}
// Hosting environment is the web server
else if (HostingEnvironment.IsUnderIISProcess && !BuildManagerHost.InClientBuildManager) {
useServerConfig = 1;
}
Interlocked.CompareExchange(ref s_useServerConfig, useServerConfig, -1);
}
return s_useServerConfig == 1;
}
}
}
}
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